How can you convert a single column into rows in Oracle?

There are multiple methods to achieve the transformation of a single column into multiple rows in Oracle database, here are some common ones:

1. The PIVOT function in Oracle allows you to transform row data into columns, achieving a single-column to multiple-row effect. For example, you can use the following syntax:
2. Show all values from your table, pivoted so that the values from column_name ‘value1’ are displayed as alias1, and the values from column_name ‘value2’ are displayed as alias2, etc.
3. By using the CASE statement in Oracle, you can convert the values of a single column into multiple columns based on specified conditions. For example, you can employ the following syntax:
4. Choose the highest value for each column type for each ID in your table.
5. Using the CONNECT BY statement in Oracle: The CONNECT BY statement can transform row data into columns based on the connection criteria. For example, the following syntax can be used:
6. Choose an ID, value1, value2, etc. from a subquery that ranks the rows based on the column_name for each ID. Then, connect the rows in sequential order starting with the first row for each ID.

The methods listed above are common options, the specific choice depends on the actual needs and data structure.